Isaac bbooke



(NoModeL) I. BROOKE.

SLATE'PENGIL SHARPENER. No. 299.729. Patented June 3, 1884.

WITNESSES: INVENTOR:

ATTOR N EY.

N. PETERS. Phuwumn m mr. Wnshing'ou D. c.

UNITED STATES PATENT OFFICE.

ISAAC BROOKE, OF POTTSTOWN, PENNSYLVANIA.

SLATE-PENCIL SHARPEN ER.

SPECIFICATION forming part of Letters Patent No. 299,729, dated June 3,1884.

Application filed October 15, 1883. (No model.)

To all who/wit may concern:

Be it known that I, ISAAC BROOKE, a citizen of the United States,residing at Pottstown, in the county of Montgomery, State ofPennsylvania, have invented a new and useful Improvement in Slate-PencilSharpeners,which is fully set forth in the following specification andaccompanying drawings, in which- Figures 1 and 2 are side elevations ofa slate-pencil sharpener embodying my invention. Fig. 3 is a top or planview thereof.

Fig. 4 is a vertical section in line 00 00, Fig. 1..

Fig. 5 is a vertical section in line y y, Fig. 2.

Similar letters of reference indicate corre sponding parts in theseveral figures.

My invention consists of a slate pencil sharpener formed of two castmetallic plates provided with cutting-edges, so constructed that twosuch edges are presented to the pencil in either direction of rotationthereof, and other advantages are presented, as will be hereinafterfully set forth.

Referring to the drawings, A represents the slate-pencil sharpener,formed of two similar plates or parts, A A, of cast metal, which areunited near the bottom and separated at top, so as to flare. In eachplate is a -V-shaped slot, B, the widest part being above, and the inneredges thereof are sharpened, forming cutters a a, radiating from below,and the in-l ner face of the top Wall of each slot has a circulardepression, b, the two depressions serving to receive the slate-pencilto be sharpened and guiding the same during the sharpening operation. Itwill be seen that as the pencil is forced into the space between thecutter and rotated it is subjected to the action of one cutter of eachplate, hence to two cutters, so

that the sharpening is quickly accomplished, 0 this double cuttingoperation being occasioned in either direction of rotation of thepencil, the pencil being also guided and sustained by the fourcutting-edges, so that the sharpening is uniform. The slots B 13 extendthe length 5 of the cutting-edges a and direct the pencildust out of thesides of the plates. It will also be seen. that the sharpener may beformed of two plates, A, similarly constructed, which may be readily setup, a single rivet or screw, as at d, being suflicient to unite them,thus producing a simple and inexpensive device,

as is evident. The fastening-rivet d is passed through the bottomportions, (1, of the plates, said portions constituting the handle ofthe 5 5 sharpener.

In the plates at the base of the cutters are depressions, formingacavity, 0, which serves to prevent breaking of the point of the pencilduring the sharpening operation.

Having thus described my invention,what I claim as new, and desire tosecure by Letters Patent, is-

l. A slate-pencil sharpener formed of two cast metallic plates, eachhaving a circular depression, b, cutting-edges a, slots 13, extendingthe length of the cutting-edges, and a handle portion, d.

2. Two cast metallic plates, each having a circular depression, I),cutting-edges a, slots B, handle portion d, and cavity 6, forming animproved slate-pencil sharpener, substantially as set forth.

ISAAC BROOKE.

